Vertiv™ | Liebert
®
STS2
™
100-1000A, 50/60Hz User Manual | Rev. 12 | 11/2017 130
17.0 MAINTENANCE
Minimal periodic maintenance of the Liebert STS2 is required. As with all electrical distribution components, the
system should be regularly inspected for electrical connection integrity, signs of excessive temperatures, dirt
accumulation, and proper system operation.
17.1 Proper Tightening of Nuts and Bolts
The recommended tightening torque for all nuts and bolts is as shown below, unless otherwise labeled. All power
connections are designed to remain at proper torque throughout the lifetime of the unit.
17.2 Testing the Liebert STS2
The Liebert STS2 includes comprehensive system alarms and fault detection to identify operational problems.
To increase the degree of confidence of proper system operation, periodic transfer tests can be easily performed.
For instructions for changing the preferred source and switching sources:
• For a Color Graphical Display unit, see 10.2 - Manual Transfer / Preferred Source Selection on page 62.
• For an LED-equipped unit, see 14.2.2 - Manual Transfer / Preferred Source Selection on page 102.
17.3 Changing the Air Filter
A standard furnace filter is installed behind the air intake in the front door. The air intake allows air to circulate to
cool the unit. Replace the filter when it becomes dirty and impedes air flow. The frequency of changing or
cleaning the filter depends on the location in which the unit is located.
The size of the filter is 1 in. x 25 in. x 25 in. (2.54 cm x 63.5 cm x 63.5 cm).
WARNING
Only properly trained and qualified service personnel should perform maintenance on the static switch.
Lethal voltages exist inside the unit during normal operation.
The unit is supplied by multiple AC power sources. Disconnect and lock-out all power sources before
working inside unit.
Table 20 Torque tightening
Bolt Shaft Size
Grade 5 - Imperial
Grade 8.8 - Metric, in-lb (Nm)
Electrical Connections
With Belleville Washers, lbf/in (Nm) *
One Belleville
Washer
Two
Belleville Washers
10-32 25 (3) — —
1/4-20 53 (6) 40 (4.5) 80 (9.0)
5/16-18 107 (12) 80 (9.0) 160 (18.0)
3/8-16 192 (22) 120 (13.6) 240 (27.1)
1/2-13 428 (48) 480 (54.2) —
* Torque values are ±10%.
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